During August, 10,000 units were produced. The standard quantity of material allowed per unit was 10 pounds at a standard cost of $3 per pound. If there was a favorable materials efficiency variance of $18,750 for August, the actual quantity of materials used must be:_______

a. 106,250 pounds.
b. 93,750 pounds.
c. 31,875 pounds.
d. 23,438 pounds